Arosa is a town and a municipality in the Plessur Region in the canton of Graubünden in Switzerland. It is both a summer and a winter tourist resort. On 1 January 2013, the former municipalities of Calfreisen, Castiel, Langwies, Lüen, Molinis, Peist and St. Peter-Pagig merged into the municipality of Arosa.At the end of 2013 the Arosa ski resort was linked with Lenzerheide by cable-car, creating the new ski resort of Arosa Lenzerheide; since that change, transport passes have been valid in bo... Wikipedia